The key is the test TST_SEL_RET on line 682. It compares the RPL of the return CS selector (saved on the stack by the original CALL) against the current CPL. If RPL == CPL, the PLA returns 0x000 (continue) and LD_DESCRIPTOR finishes normally -- same-privilege return. If RPL CPL, the caller is returning to a less-privileged ring, so the PLA redirects to 0x686 (RETF_OUTER_LEV) -- the cross-privilege path that must also restore the caller's stack. If RPL
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。业内人士推荐safew官方版本下载作为进阶阅读
// ⚠️ 易错点1：长度≤1的数组本身有序，返回0而非n，推荐阅读快连下载安装获取更多信息
const n = position.length;
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